Safety Measurement System

Measure vs. Percentile

Carrier violations or crashes are weighted by time and severity to produce a measure for that carrier in each BASIC. The measure is then used to assign that carrier to a percentile rank containing carriers’ information in similar safety event groups. Expand for more information.

Carrier violations or crashes are weighted by time and severity to produce a measure for that carrier in each BASIC. The measure only considers individual performance based on 24 months of data, with a measure of 0 indicating best performance. The measure is then used to assign that carrier to a percentile rank containing carriers’ information in similar safety event groups. The graph below shows how the carrier’s measure correlates with its percentile rank over a selected period of time.

Measure

Percentile

Measure	Percentile
0	0
0.08	1
0.11	2
0.13	3
0.15	4
0.17	5
0.18	6
0.20	7
0.22	8
0.25	9
0.26	10
0.28	11
0.30	12
0.34	13
0.34	14
0.36	15
0.39	16
0.41	17
0.44	18
0.50	19
0.51	20
0.54	21
0.57	22
0.60	23
0.64	24
0.68	25
0.70	26
0.75	27
0.78	28
0.81	29
0.84	30
0.88	31
0.91	32
1.00	33
1.01	34
1.02	35
1.03	36
1.11	37
1.15	38
1.17	39
1.21	40
1.26	41
1.29	42
1.34	43
1.40	44
1.41	45
1.44	46
1.51	47
1.55	48
1.60	49
1.67	50
1.68	51
1.75	52
1.76	53
1.78	54
1.84	55
1.90	56
2.00	57
2.02	58
2.03	59
2.11	60
2.18	61
2.25	62
2.33	63
2.34	64
2.35	65
2.40	66
2.51	67
2.57	68
2.63	69
2.69	70
2.80	71
2.84	72
3.00	73
3.02	74
3.04	75
3.17	76
3.26	77
3.38	78
3.50	79
3.52	80
3.64	81
3.76	82
3.89	83
4.02	84
4.19	85
4.30	86
4.50	87
4.67	88
4.76	89
5.02	90
5.25	91
5.43	92
5.71	93
6.03	94
6.43	95
7.00	96
7.43	97
8.30	98
9.81	99
21.33	100